98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
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/* util.c -- Utility functions for OpenRISC 1000.
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*
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* Copyright (c) 2014 Authors
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*
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* Contributor Julius Baxter <julius.baxter@orsoc.se>
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* Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de>
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <reent.h>
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#include "or1k-internals.h"
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#ifdef __OR1K_MULTICORE__
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// Define pointers to arrays
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uint8_t* *_or1k_stack_core;
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uint8_t* *_or1k_exception_stack_core;
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uint32_t* *_or1k_exception_level;
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#else
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// Define scalar
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uint32_t _or1k_exception_level;
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#endif
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uint8_t* _or1k_stack_top;
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uint8_t* _or1k_stack_bottom;
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uint8_t* _or1k_exception_stack_top;
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uint8_t* _or1k_exception_stack_bottom;
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void _or1k_init() {
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#ifdef __OR1K_MULTICORE__
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uint32_t c;
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// Initialize stacks
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_or1k_stack_core = _sbrk_r(0, sizeof(uint8_t*) * or1k_numcores());
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_or1k_exception_stack_core = _sbrk_r(0, sizeof(uint8_t*) * or1k_numcores());
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_or1k_stack_core[0] = _or1k_stack_top;
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_or1k_exception_stack_core[0] = _or1k_exception_stack_top;
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for (c = 1; c < or1k_numcores(); c++) {
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_or1k_stack_core[c] = _or1k_stack_core[c-1] - _or1k_stack_size;
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_or1k_exception_stack_core[c] = _or1k_exception_stack_core[c-1] -
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_or1k_exception_stack_size;
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}
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size_t exc_size = sizeof(void*) * or1k_numcores() * OR1K_NUM_EXCEPTIONS;
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_or1k_exception_handler_table = _sbrk_r(0, exc_size);
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size_t int_size = sizeof(void*) * or1k_numcores() * 32;
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size_t intdata_size = sizeof(void*) * or1k_numcores() * 32;
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_or1k_interrupt_handler_table = _sbrk_r(0, int_size);
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_or1k_interrupt_handler_data_ptr_table = _sbrk_r(0, intdata_size);
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#endif
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_or1k_reent_init();
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#ifdef __OR1K_MULTICORE__
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for (c = 0; c < or1k_numcores(); c++) {
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_or1k_exception_handler_table[c][6] = _or1k_interrupt_handler;
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}
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#else
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_or1k_exception_handler_table[6] = _or1k_interrupt_handler;
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#endif
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#ifdef __OR1K_MULTICORE__
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_or1k_exception_level = _sbrk_r(0, 4 * or1k_numcores());
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for (c = 0; c < or1k_numcores(); c++) {
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_or1k_exception_level[c] = 0;
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}
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#else
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_or1k_exception_level = 0;
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#endif
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}
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uint32_t or1k_critical_begin() {
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uint32_t iee = or1k_interrupts_disable();
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uint32_t tee = or1k_timer_disable();
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return (iee << 1) | tee;
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}
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void or1k_critical_end(uint32_t restore) {
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or1k_timer_restore(restore & 0x1);
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or1k_interrupts_restore((restore >> 1) & 0x1);
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}
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